Kaatrin Mozhi (transl. The language of air) is a 2018 Indian Tamil-language comedy drama film written and directed by Radha Mohan, and starring Jyothika in lead role. The film also features Vidharth and Lakshmi Manchu in supporting roles. It is a remake of the Hindi-language film Tumhari Sulu (2017). The film narrates the story of an ambitious housewife who becomes a radio jockey for a late-night relationship advice show. The film was released worldwide in November 2018. The film's title was taken from a song from Mozhi, which was also directed by Mohan and featuring Jyothika in the lead.